RHEL6.8: After updating to 6.8 system hung with soft lockups involving nfs and fscache

Solution Verified - Updated -

Issue

  • We were running fine on the 573.8.1 kernel.
  • System hangs with soft lockup messages involving __fscache_disable_cookie
 kernel:BUG: soft lockup - CPU#6 stuck for 68s! [perl:1207]
...
RIP: 0010:[<ffffffff8154aa17>]  [<ffffffff8154aa17>] _spin_unlock_irqrestore+0x17/0x20
...
Call Trace:
 [<ffffffff810a6dee>] ? prepare_to_wait+0x4e/0x80
 [<ffffffff81548732>] ? out_of_line_wait_on_atomic_t+0x92/0xe0
 [<ffffffff8154872c>] ? out_of_line_wait_on_atomic_t+0x8c/0xe0
 [<ffffffffa053f930>] ? rpcauth_lookupcred+0x80/0xd0 [sunrpc]
 [<ffffffff810a6b00>] ? wake_atomic_t_function+0x0/0x40
 [<ffffffffa03b0063>] ? __fscache_disable_cookie+0x123/0x200 [fscache]
 [<ffffffffa06012cd>] ? nfs_fscache_open_file+0xad/0x100 [nfs]
 [<ffffffffa05c7e28>] ? nfs_open+0x78/0x90 [nfs]
 [<ffffffffa05c6080>] ? nfs_file_open+0x0/0xc0 [nfs]

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